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Related Experiment Video

Updated: Apr 23, 2026

Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention

Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention

Published on: September 18, 2015

Nitinol stent design - understanding axial buckling.

D J McGrath¹, B O Brien¹, M Bruzzi¹

¹Biomechanics Research Centre (BMEC), Biomedical Engineering, College of Engineering and Informatics, NUI Galway, Ireland.

Journal of the Mechanical Behavior of Biomedical Materials

|September 26, 2014

Summary

This study investigated nitinol stent buckling during crimping. Reducing transitional material in stent hinges significantly increases nitinol stent stability and prevents buckling.

Keywords:

Buckling Design Finite element method Nitinol Stent

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Area of Science:

Biomedical Engineering
Materials Science

Background:

Nitinol's superelasticity enables self-expanding stents but its nonlinear properties can cause buckling.
Stent buckling during crimping is a critical failure mode affecting device performance.

Purpose of the Study:

Investigate axial buckling in a prototype tracheobronchial nitinol stent during crimping.
Identify design modifications to eliminate stent buckling.

Main Methods:

Simulated a radial force test using a computational model with introduced geometric defects to induce buckling.
Performed a sensitivity study on the nitinol loading curve's transitional plateau region's effect on stent stability.

Main Results:

The transitional plateau region of the nitinol loading curve significantly impacts stent stability during crimping.
Reducing transitional material in stent hinges increases nitinol stent stability.

Conclusions:

The transitional plateau region is a key factor in nitinol stent buckling.
Modifying stent hinge design to reduce transitional material effectively enhances stent stability and prevents buckling.